Fury of the Berserker

When you fall below a quarter of your health, your Hits are converted to Double Hits on Melee attacks.

is a passive boost skill which costs no mana to use. Combined with Resilience, you can be a devastating attack machine as long as you can avoid being killed.

Requires

 * Whirlwind
 * 2+ other talents
 * Resilience
 * Battle Charge